161870047 has 2 divisors, whose sum is σ = 161870048. Its totient is φ = 161870046.

The previous prime is 161869997. The next prime is 161870053. The reversal of 161870047 is 740078161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161870047 - 2⁷ = 161869919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161869994 and 161870021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161870077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80935023 + 80935024.

It is an arithmetic number, because the mean of its divisors is an integer number (80935024).

Almost surely, 2^161870047 is an apocalyptic number.

161870047 is a deficient number, since it is larger than the sum of its proper divisors (1).

161870047 is an equidigital number, since it uses as much as digits as its factorization.

161870047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 161870047 is about 12722.8160011846. The cubic root of 161870047 is about 544.9903732553.

The spelling of 161870047 in words is "one hundred sixty-one million, eight hundred seventy thousand, forty-seven".